Question

1. You are calculating the rate of reaction for A⁺ + B^- → AB. Your tangent line slopes are from graphs of absorbance of A⁺ versus time in minutes. You have the following experimental data:

Trial	[A+] in M	[B-] in M	Tangent Line Slope in Abs/min
1	1.00	0.380	-0.540
2	1.00	1.00	-1.89
2	0.25	0.380	-0.170

Convert the slope of Trial 1 to a rate with units of M/min. The molar absorptivity of A⁺ is 38700 M^-1cm^-1.

2.

Using the data from Question 2 (copied below), determine the reaction order with respect to species A⁺. You will need to convert the other tangent line slopes into rates of reaction in order to do this.

Question 2: You are calculating the rate of reaction for A⁺ + B^- → AB. Your tangent line slopes are from graphs of absorbance of A⁺ versus time in minutes. You have the following experimental data:

Answer 1

1.

Slope of trial 1

Rate ( in M/min)

2.

For trial 1 the rate ( in M/min)

For trial 3 the rate ( in M/min)

For trials 1 and 3, the concentration of B- is held constant. The concentration of A+ is quadrapuled from 0.25 M to 1.00 M. The rate of the reaction increases from to

For trial 1

....(1)

For trial 2

....(2)

Divide equation (1) with equation (2)

Take log on both sides

The order of the reaction with respect to A+ is approximately equal to 1.